45-а=9

The equation you've given is:

45 - a = 9

To find the value of 'a,' you need to isolate the variable on one side of the equation. You can do this by adding 'a' to both sides and subtracting 9 from both sides to keep the equation balanced.

Adding 'a' to both sides:

45 - a + a = 9 + a

This simplifies to:

45 = 9 + a

Now, subtracting 9 from both sides:

45 - 9 = 9 + a - 9

So that simplifies to:

36 = a

Therefore, the solution to the equation is:

a = 36